Menu and navigation add additional css classes 1.6

I have a website running on Orchard 1.4.2.0. This site uses Piotr Szmyd´s Advanced menu module in the main navigation bar. This module allows add additional CSS classes to each menu item.

I would like to update that site to orchard 1.6, but the navigation component does not allow to set a custom css. This the Html code of the main menu that I would like to upgrade. Each menu item family needs a different color or different css style. Code generated
using Piotr Szmyd´s Advanced menu module: